JP5253269B2 - Gate valve - Google Patents

Description

  The present invention relates to a gate valve having guide means for guiding a valve body in an opening / closing direction.

  Conventionally, as this kind of gate valve, for example, as shown in FIGS. 13 and 14, a cast iron valve box 4 having a valve box internal passage 2 and a valve body storage space 3 therein, A valve body 6 that opens and closes the flow path 2 in the valve box by moving in the opening / closing direction A across (orthogonal to) the flow path 2 in the valve box between the flow path 2 and the valve body storage space 3; There is a soft seal gate valve 1 having a valve rod 7 that moves in the opening / closing direction A and a guide means 8 that guides the valve body 6 in the opening / closing direction A.

  As shown in FIG. 15, the valve body 6 includes a valve body body 9 made of cast iron and a rubber lining 10 that covers the outer surface of the valve body body 9. As shown in FIG. 13, a female thread piece 11 is provided on the upper portion of the valve body 6, and the valve stem 7 is screwed into the female thread piece 11. An upper valve body sheet 12 is formed by a rubber lining 10 on the outer peripheral edge of the upper part of the valve body 6, and a lower valve body sheet 13 is formed by a rubber lining 10 on the outer peripheral edge of the lower part of the valve body 6. The upper valve body sheet 12 and the lower valve body sheet 13 are continuous at both ends.

  An upper valve box sheet 14 and a lower valve box sheet 15 are formed inside the valve box 4, and when fully closed, the upper valve body sheet 12 contacts the upper valve box sheet 14 and the lower valve body sheet 13 is lower. It contacts the valve box sheet 15.

  As shown in FIGS. 14 to 17, the guiding means 8 is provided on the both sides of the valve body 6 in the width direction B and the convex guide protrusions 16 formed on the inner surface of the valve box 4 along the opening / closing direction A. A concave guide groove 17 provided and a guide piece 18 provided in the guide groove 17 are provided. The width direction B of the valve body 6 is a direction orthogonal to the flow path axis 19 of the flow path 2 in the valve box and orthogonal to the opening / closing direction A.

  The guide protrusion 16 has a pair of outer surfaces 16a and 16b facing each other in the direction of the flow path axis 19, and a tip surface 16c formed between the tip portions of the outer surfaces 16a and 16b. As shown in FIG. 17, it is fitted in the guide groove 17.

  The guide piece 18 has a pair of side plate portions 18a and 18b opposite to each other in the direction of the flow path axis 19 and a back plate portion 18c provided between the back end portions of the side plate portions 18a and 18b. It is fitted in the guide groove 17 and adhered to the rubber lining 10, and is movable in the opening / closing direction A with respect to the guide protrusion 16.

  One side plate portion 18a of the guide piece 18 opposes one outer surface 16a of the guide protrusion 16, and the other side plate portion 18b of the guide piece 18 opposes the other outer surface 16b of the guide protrusion 16. The back plate portion 18 c of the piece 18 faces the tip surface 16 c of the guide protrusion 16.

The inner surface of the valve box 4 is painted by spray painting.
Hereinafter, the operation of the above configuration will be described.
By rotating the valve rod 7, the valve body 6 moves in the opening / closing direction A between the fully closed position S and the fully open position O. As shown by the solid line in FIG. 13 and the phantom line in FIG. 14, when the valve body 6 moves to the fully closed position S, the upper valve body sheet 12 is pressed against the upper valve box sheet 14 and the lower valve body sheet 13 is in the lower part. Further, both end surfaces of the valve body 6 in the direction of the flow axis 19 (thickness direction) are in pressure contact with the inner surface of the valve box 4. Thereby, the flow path 2 in the valve box is closed, and the upstream side and the downstream side of the valve body 6 are sealed.

  Further, when the valve body 6 moves in the opening / closing direction A, as shown in FIG. 17, one side plate portion 18a of the guide piece 18 slides with respect to one outer side surface 16a of the guide protrusion 16, The valve body 6 can be prevented from shifting in one direction C of the flow axis 19, and the other side plate portion 18 b of the guide piece 18 slides with respect to the other outer surface 16 b of the guide protrusion 16. By moving, it is possible to prevent the valve body 6 from shifting in the other direction D of the flow axis 19, and the back plate portion 18 c of the guide piece 18 is further with respect to the distal end surface 16 c of the guide protrusion 16. Thus, the valve body 6 can be prevented from shifting in the width direction B of the valve body 6. Thereby, the valve body 6 moves in the opening / closing direction A without being swayed in the directions C and D and the width direction B of the flow path axis 19 while being guided by the guide means 8.

  Further, since the guide piece 18 is provided, the rubber lining 10 of the valve body 6 and the guide protrusion 16 of the valve box 4 are not in direct sliding contact with each other at the time of opening and closing. The valve body 6 can be opened and closed smoothly with force.

  In addition, the gate valve which has the above guide means is described in the following patent document 1, for example.

JP-A-60-179576

  However, in the above conventional type, as shown in FIG. 17, when the force F1 in the width direction B acts on the valve body 6, both side plates 18a, 18b of the guide piece 18 are parallel to the direction of the force F1. Yes, since the back plate portion 18c of the guide piece 18 is orthogonal to the direction of the force F1, the back plate portion 18c of the guide piece 18 comes into surface contact with the distal end surface 16c of the guide protrusion 16, and the force F1 is It cannot be received by the side plate portions 18 a and 18 b of the guide piece 18 but can be received only by the back plate portion 18 c of the guide piece 18. As a result, there is a problem that the load applied to the rubber lining 10 in the back side portion of the back plate portion 18c of the guide piece 18 is increased, and the life of the rubber lining 10 in this portion is shortened.

  Further, when a force F2 in one direction C of the flow path axis 19 is applied to the valve body 6, one side plate portion 18a of the guide piece 18 comes into contact with one outer surface 16a of the guide protrusion 16. There is a problem that stress concentrates on the corner 21a at the base between the one side plate portion 18a and the back plate portion 18c of the guide piece 18 and the guide piece 18 is easily cracked.

  Similarly, when a force F3 in the other direction D of the flow path axis 19 acts on the valve body 6, stress concentrates on the corner 21b at the base of the other side plate portion 18b and the back plate portion 18c of the guide piece 18. There is a problem that the guide piece 18 is easily cracked.

  When the rubber lining 10 is injection-molded on the outer surface of the valve body 9 of the valve body 6, as shown in FIG. 18, the mold 23 used is an upper main mold 24, a lower main mold 25, and an upper auxiliary. A mold 26 and a lower auxiliary mold 27 are provided. The upper auxiliary mold 26 and the lower auxiliary mold 27 are for holding the guide piece 18 at a predetermined position inside the upper main mold 24 and the lower main mold 25.

  According to this, when the rubber lining 10 is injection-molded and then released, it is possible to release the upper main mold 24 and the lower main mold 25 in the vertical direction E (the thickness direction of the valve body 6). However, the upper auxiliary die 26 and the lower auxiliary die 27 cannot be released in the vertical direction E, but are released in the left-right direction G (the width direction of the valve body 6) perpendicular to the vertical direction E. There is a need to.

Thus, since it is necessary to release the molds 24 to 27 in different directions, the configuration of the mold 23 becomes complicated, and there is a problem that it takes time and effort for injection molding.
The present invention can prevent the life of the covering member from being shortened, can prevent the guide piece from cracking, and further, when the covering member is injection molded on the valve body of the valve body An object of the present invention is to provide a gate valve that can be easily injection-molded.

In order to achieve the above object, the first invention includes a valve box having a flow path in the valve box therein, a valve body for opening and closing the flow path in the valve box, and guide means for guiding the valve body in the opening and closing direction. A gate valve having
The valve body is composed of a valve body main body and a covering member that covers the outer surface of the valve body main body,
The guide means is a concave guide groove formed on the inner surface of the valve box along the opening and closing direction, and a convex shape provided on the side surface in the width direction of the valve body and fitted in the guide groove and movable in the opening and closing direction. And a guide piece covering the outer surface of the guide protrusion,
The guide groove has a pair of groove inner surfaces facing each other in the flow axis direction of the flow path in the valve box, and a groove inner surface formed between the inner ends of both groove inner surfaces,
The guide piece has a pair of outer surfaces facing the inner surface of the groove and an outer end surface facing the groove inner surface,
Each of the pair of groove inner surfaces of the guide groove is inclined so that the distance between the pair of groove inner surfaces decreases toward the back of the guide groove,
Each of the pair of outer surfaces of the guide piece is inclined such that the distance between the pair of outer surfaces decreases toward the outer side in the width direction of the valve body ,
When fully closed, both side surfaces in the width direction of the valve body and both end surfaces in the flow axis direction are in contact with the inner surface of the valve box, and a gap is formed between the guide piece and the guide groove .

  According to this, when the valve body moves in the opening / closing direction, the one outer surface of the guide piece slides with respect to the inner surface of one of the guide grooves, so that the valve body moves in one direction of the flow axis. It is possible to prevent the displacement, and the other outer surface of the guide piece slides with respect to the inner surface of the other groove of the guide groove, whereby the valve body is displaced in the other direction of the flow axis. Can be prevented. Further, the outer end surface of the guide piece slides with respect to the groove inner surface of the guide groove, whereby the valve body can be prevented from shifting in the width direction orthogonal to the flow path axis.

  In addition, when a force in the width direction perpendicular to the flow path axis acts on the valve body, the pair of groove inner side surfaces of the guide groove and the pair of outer side surfaces of the guide pieces are inclined, so The end surface is in contact with the groove inner surface of the guide groove and both outer surfaces of the guide piece are in contact with both inner surfaces of the guide groove, and the force is received by the three surfaces of the outer end surface and both outer surfaces of the guide piece. Thereby, since the said force can be received in a distributed manner, the load applied to the covering member on the back side portion of the guide piece is dispersed and reduced, and the shortening of the life of the covering member in this portion can be prevented.

  Also, when spraying the inner surface of the valve box with powder paint, the pair of groove inner surfaces of the guide groove is inclined so that the distance between the pair of groove inner surfaces decreases toward the back of the guide groove, The spraying direction of the paint and the inner surface of the groove do not become parallel, whereby a uniform coating film can be formed on the inner surface of the groove.

  In addition, since the convex guide protrusion is provided on the valve body, when the covering member is injection molded on the valve body body of the valve body, all the molds used for the injection molding are released in the thickness direction of the valve body. Therefore, injection molding can be easily performed.

In the gate valve according to the second aspect of the invention, the fillet portion between the side surface of the valve body and the base of the guide protrusion is not covered with the guide piece, and the covering member is exposed.
According to this, when a force in one direction of the flow path axis acts on the valve body, one outer surface of the guide piece comes into contact with one inner surface of the guide groove, but the side surface of the valve body and the guide protrusion Since the fillet portion with the base of the metal is not covered with the guide piece, it is possible to prevent the guide piece from cracking or peeling even when stress is concentrated on the fillet portion.

Similarly, when a force in the other direction of the flow path axis acts on the valve body, it is possible to prevent the guide piece from cracking or peeling even if stress is concentrated on the fillet portion.
In the gate valve according to the third aspect of the invention , the valve body is positioned in the width direction when fully closed.

  According to this, if the valve body is displaced without being positioned in the width direction of the valve body when fully closed, the water is not stopped even in the fully closed position, and is tightened further than the fully closed position to stop the water. There is a problem in that it is necessary to stop the water by excessively deforming the covering member, and the tightening torque required for full closure increases.

  On the other hand, in the third aspect of the invention, when the valve body is fully closed, the valve body is positioned in the width direction of the valve body, so that the water stop is ensured, and the tightening torque required to fully close is always stable, An increase in tightening torque can be prevented.

In the gate valve according to the fourth aspect of the present invention, the height from the outer end surface of the guide piece to the distal end portion of the outer surface in the width direction of the valve body is higher than the depth of the guide groove.
According to this, when the valve body moves in the opening / closing direction and one outer surface of the guide piece slides with respect to the inner surface of one of the guide grooves, the covering member of the valve body moves to one groove of the guide groove. It is possible to reliably prevent sliding contact with the inner surface. Similarly, when the other outer surface of the guide piece slides with respect to the inner surface of the other groove of the guide groove, the cover member of the valve body is reliably prevented from sliding on the inner surface of the other groove of the guide groove. be able to.

  As described above, according to the present invention, it is possible to prevent the life of the covering member from being shortened, to prevent the guide piece from being cracked or peeled, and further to the valve body of the valve body. When the covering member is injection-molded, injection molding can be easily performed.

It is the front view which carried out the cross section display of the right half of the gate valve in the 1st Embodiment of this invention. It is sectional drawing seen from the side of the valve box of the gate valve. It is a side view of the valve body of a gate valve. FIG. 4 is an enlarged cross-sectional view of a portion of a guide protrusion of a valve body of the gate valve. It is an enlarged cross-sectional view of the location of the guide groove of the valve box of the gate valve. FIG. 3 is an enlarged cross-sectional view of the guiding means when the valve body of the gate valve is in a position opened to the open side from the fully closed position, and is a view taken along arrow XX in FIG. 1. FIG. 3 is an enlarged cross-sectional view of the guiding means when the valve body of the gate valve is in a fully closed position, and is a view taken along the arrow YY in FIG. 1. It is a schematic diagram of the metal mold | die used when injection-molding the rubber lining of the valve body of a gate valve. It is an expanded cross-sectional view of the location of the guidance protrusion part of the valve body of the gate valve in the 2nd Embodiment of this invention. It is an expanded cross-sectional view of the location of the guidance protrusion part of the valve body of the gate valve in the 3rd Embodiment of this invention. It is an expansion cross-sectional view of the guide means of the gate valve in the 4th Embodiment of this invention. It is an expansion cross-sectional view of the guide means of the gate valve in the 5th Embodiment of this invention. It is the side view which displayed the cross section of the half of the conventional gate valve. It is the front view which carried out the cross section display of the right half of the gate valve. FIG. 6 is an enlarged cross-sectional view of a guide groove portion of the valve body of the gate valve. FIG. 3 is an enlarged cross-sectional view of a portion of a guide protrusion of a valve box of the gate valve. It is a XX arrow line view in FIG. It is a schematic diagram of the metal mold | die used when injection-molding the rubber lining of the valve body of a gate valve.

Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In addition, about the same member as the conventional thing mentioned above, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.
As shown in FIGS. 1, 3, and 4, the valve element 41 includes a cast iron valve element body 42 and a rubber lining 43 (an example of a covering member) that covers the outer surface of the valve element body 42. It is guided in the opening / closing direction A by means 44.

  The valve body main body 42 has a valve body plate portion 45 having a V-shaped lower portion and an arc shape other than the lower portion, and a thickness direction of the valve body 41 from a peripheral edge of the arc-shaped portion of the valve body plate portion 45. And an arcuate edge 46 projecting toward the top.

  As shown in FIGS. 2 to 6, the guide means 44 is provided on the concave guide grooves 48 formed on the inner surface of the valve box 4 along the opening / closing direction A, and on both side surfaces 54 in the width direction B of the valve body 41. A convex guide protrusion 49 that is provided and fits in the guide groove 48 and is movable in the opening and closing direction A, and a guide piece 50 that covers the outer surface of each guide protrusion 49. As shown in FIG. 1, a pair of left and right guide grooves 48 in the width direction B are formed. As shown in FIG. 4, the guide protrusion 49 includes a cast iron protrusion main body 51 formed integrally with the valve body main body 42 and a rubber lining 43 that covers the outer surface of the protrusion main body 51. The guide piece 50 covers the outer surface of the guide protrusion 49 from the outside of the rubber lining 43.

  As shown in FIG. 5, the guide groove 48 includes a pair of groove inner side surfaces 48 a and 48 b that face each other in the direction of the flow axis 19 of the valve box inner flow channel 2, and the inner ends of both groove inner side surfaces 48 a and 48 b. And a groove back surface 48c formed therebetween. Both the groove inner side surfaces 48a and 48b are inclined so that the distance between the pair of groove inner side surfaces 48a and 48b decreases toward the back of the guide groove 48. The inclination angle θ1 of each groove inner side surface 48a, 48b is set to, for example, about 10 ° to 30 °.

  As shown in FIG. 4, the guide piece 50 includes a pair of side plate portions 50a and 50b facing each other in the direction of the flow path axis 19 and an end plate portion 50c provided between the outer end portions of the side plate portions 50a and 50b. The cross section is formed in a U shape. One side plate portion 50a has one outer surface 52a facing one groove inner surface 48a, and the other side plate portion 50b has the other outer surface 52b facing the other groove inner surface 48b. The portion 50c has an outer end surface 52c that faces the groove back surface 48c.

  The pair of outer surfaces 52a and 52b are inclined such that the distance between the pair of outer surfaces 52a and 52b decreases toward the outer side in the width direction B of the valve body 41. Note that the inclination angle θ2 of each of the outer surfaces 52a and 52b is set to be the same as the inclination angle θ1 of each of the groove inner surfaces 48a and 48b.

  As the material of the guide piece 50, a polyamide-based resin (for example, nylon 6, 6) or the like is used, but other materials having a low friction coefficient may be used. The guide piece 50 is integrally molded (vulcanized and bonded) with the rubber lining 43, and is embedded in the rubber lining 43 at a depth corresponding to the thickness of the guide piece 50 as shown in FIG. Thereby, the outer side surfaces 52a and 52b of the guide piece 50 are respectively flush with the outer surface of the rubber lining 43 and are continuous without a step.

The fillet portion 55 between the side surface 54 in the width direction B of the valve body 41 and the root of the guide protrusion 49 is not covered with the guide piece 50 and the rubber lining 43 is exposed.
Further, as shown in the phantom line of FIG. 1 and FIG. 7, in the fully closed position S, both side surfaces 54 of the valve body 41 abut against the inner surface of the valve box 4 and the valve body 41 is positioned in the width direction B. At the same time, both end faces 56 of the edge 46 of the valve body 41 in the direction of the flow axis 19 contact the inner surface of the valve box 4, and the valve body 41 is positioned in the direction of the flow axis 19 to stop water. At this time, there is a slight gap between one groove inner surface 48a and one outer surface 52a, between the other groove inner surface 48b and the other outer surface 52b, and between the groove back surface 48c and the outer end surface 52c. A gap 57 is formed.

  As shown in FIG. 6, when the valve body 41 is positioned on the opening direction side (upward side) with respect to the fully closed position S, a gap 58 is formed between the side surface 54 of the valve body 41 and the inner surface of the valve box 4. A gap 59 is formed between the end surface 56 of the valve body 41 and the inner surface of the valve box 4. At this time, one outer surface 52a is slidably contactable with one groove inner surface 48a, the other outer surface 52b is slidably contacted with the other groove inner surface 48b, and the outer end surface 52c is a grooved. It is slidable with respect to the back surface 48c.

Hereinafter, the operation of the above configuration will be described.
As shown in FIG. 1, by rotating the valve rod 7, the valve body 41 moves in the opening / closing direction A between the fully closed position S and the fully open position O. At this time, as shown in FIG. 6, the one outer surface 52 a of the guide piece 50 slides with respect to the one groove inner surface 48 a of the guide groove 48, so that the valve body 41 is one of the flow path shafts 19. Transition to the direction C can be prevented. Further, the other outer surface 52 b of the guide piece 50 slides with respect to the other groove inner surface 48 b of the guide groove 48, thereby preventing the valve body 41 from changing in the other direction D of the flow path axis 19. can do. Furthermore, when the outer end surface 52c of the guide piece 50 slides with respect to the groove inner surface 48c of the guide groove 48, the valve body 41 can be prevented from shifting in the width direction B.

  Further, since the guide piece 50 is provided, the rubber lining 43 of the valve element 41 is not directly slidably contacted with the groove inner side surfaces 48a and 48b and the groove rear surface 48c of the guide groove 48 at the time of opening and closing. The force is reduced, and the valve body 41 can be opened and closed smoothly with a small force.

  Further, when the force F1 in the width direction B acts on the valve body 41, the pair of groove inner side surfaces 48a and 48b of the guide groove 48 and the pair of outer side surfaces 52a and 52b of the guide piece 50 are inclined, The outer end surface 52c of the guide piece 50 is in contact with the groove inner surface 48c of the guide groove 48 and the outer side surfaces 52a and 52b are in contact with both inner side surfaces 48a and 48b. The force F1 is applied to the outer end surface 52c of the guide piece 50. It is received by three surfaces, both outer surfaces 52a and 52b. Thereby, since the force F1 can be received in a distributed manner, the load applied to the rubber lining 43 on the back side portion of the guide piece 50 is dispersed and reduced, and the shortening of the life of the rubber lining 43 in this portion is prevented. Can do.

  Further, when a force F2 in one direction C of the flow path axis 19 is applied to the valve body 41, one outer surface 52a of the guide piece 50 comes into contact with one groove inner surface 48a of the guide groove 48. Since the fillet portion 55 (see FIG. 4) 41 is not covered with the guide piece 50, it is possible to prevent the guide piece 50 from cracking or peeling even if stress is concentrated on the fillet portion 55. it can.

Similarly, when the force F3 in the other direction D of the flow axis 19 acts on the valve body 41, even if stress is concentrated on the fillet portion 55, the guide piece 50 is prevented from cracking or peeling. be able to.
As shown in the phantom line of FIG. 1 and FIG. 7, when the valve body 41 is moved to the fully closed position S to be in the fully closed state, both side surfaces 54 of the valve body 41 abut against the inner surface of the valve box 4, The valve body 41 is positioned in the width direction B, and both end faces 56 of the valve body 41 abut against the inner surface of the valve box 4, so that the valve body 41 is positioned in the direction of the flow path axis 19 and stops.

  Therefore, if the valve element 41 is displaced without being positioned in the width direction B when fully closed, the water is not stopped even at the fully closed position S, and the rubber is tightened further than the fully closed position S to stop the water. It is necessary to stop the water by deforming the lining 43 excessively, and a problem arises that the tightening torque required to fully close the lining 43 increases.

  In contrast, in the first embodiment, when the valve body 41 is fully closed, the valve body 41 is positioned in the width direction B, so that water-stopping is ensured, and the tightening torque required to fully close is always stable. Thus, an increase in tightening torque can be prevented.

  Further, as shown by phantom lines in FIG. 5, when the inner surface of the valve box 4 is spray-coated with a powder paint, the pair of groove inner side surfaces 48 a, 48 b of the guide groove 48 are formed as a pair of grooves toward the back of the guide groove 48. Since the gap between the inner side surfaces 48a and 48b is inclined so as to be reduced, the spray direction J of the paint sprayed from the paint spraying device 61 and the groove inner side surfaces 48a and 48b do not become parallel to each other. A uniform coating film can be formed on the inner side surfaces 48a, 48b.

  When the rubber lining 43 is injection-molded on the outer surface of the valve body 42 of the valve body 41, as shown in FIG. 8, the mold 62 to be used is an upper main mold 63, a lower main mold 64, and an upper auxiliary. A mold 65 and a lower auxiliary mold 66 are provided. The upper auxiliary mold 65 and the lower auxiliary mold 66 are for holding the guide piece 50 at predetermined positions inside the upper main mold 63 and the lower main mold 64.

  According to this, when the rubber lining 43 is injection-molded and then released, the upper main mold 63 and the lower main mold 64 are released in the vertical direction E (the thickness direction of the valve body 41). The upper auxiliary mold 65 and the lower auxiliary mold 66 can also be released in the vertical direction E. As described above, since all the dies 63 to 66 can be released in the same direction (vertical direction E), injection molding can be easily performed. Further, when the upper main mold 63 and the upper auxiliary mold 65 are integrated and the lower main mold 64 and the lower auxiliary mold 66 are integrated, the process of setting and releasing the mold is further simplified. Can do.

  In the first embodiment, the guide piece 50 is embedded in the rubber lining 43 at a depth corresponding to the thickness of the guide piece 50, as shown in FIG. As shown in FIG. 9, the guide piece 50 is embedded in the rubber lining 43 at a depth corresponding to substantially half the thickness of the guide piece 50. As a result, the outer side surfaces 52 a and 52 b of the guide piece 50 protrude outward from the outer surface of the rubber lining 43 by a height corresponding to approximately half the thickness of the guide piece 50. Accordingly, it is possible to prevent the rubber lining 43 from slidingly contacting the groove inner side surfaces 48 a and 48 b of the guide groove 48.

  In the first and second embodiments, the guide piece 50 is embedded in the rubber lining 43. However, in the third embodiment, the guide piece 50 is embedded in the rubber lining 43 as shown in FIG. It is bonded to the surface of the rubber lining 43. As a result, the outer surfaces 52 a and 52 b of the guide piece 50 protrude outward from the outer surface of the rubber lining 43 by a height corresponding to the thickness of the guide piece 50. Accordingly, it is possible to prevent the rubber lining 43 from slidingly contacting the groove inner side surfaces 48 a and 48 b of the guide groove 48.

Next, a fourth embodiment of the present invention will be described with reference to FIG.
The height H from the outer end surface 52 c of the guide piece 50 in the width direction B of the valve body 1 to the distal end portions of the outer surfaces 52 a and 52 b is higher than the depth I of the guide groove 48.

  According to this, when the valve body 41 moves in the opening / closing direction A and the one outer surface 52a of the guide piece 50 slides with respect to the one groove inner surface 48a of the guide groove 48, the rubber lining of the valve body 41 is provided. 43 can be reliably prevented from slidingly contacting the one groove inner surface 48a. Similarly, when the other outer surface 52b of the guide piece 50 slides with respect to the other groove inner side surface 48b of the guide groove 48, it is ensured that the rubber lining 43 comes into sliding contact with the other groove inner side surface 48b. Can be prevented.

  In the fourth embodiment, the height H of the guide piece 50 is set higher than the depth I of the guide groove 48, but as a fifth embodiment, as shown in FIG. The height H may be lower than the depth I of the guide groove 48, and the guide piece 50 may be attached only to the tip of the guide protrusion 49.

According to this, the guide piece 50 enters the inside of the guide groove 48, but since the effect of reducing the frictional force is exhibited, the valve body 41 can be opened and closed smoothly with a small force.
In each of the above embodiments, the guide piece 50 is mounted on the valve body 41 when the rubber lining 43 of the valve body 41 is injection molded. However, after the rubber lining 43 is injection molded, the guide piece 50 is attached to the adhesive. It may be adhered by, for example.

DESCRIPTION OF SYMBOLS 1 Gate valve 2 Flow path in valve box 4 Valve box 19 Flow axis 41 Valve body 42 Valve body main body 43 Rubber lining (covering member)
44 Guide means 48 Guide groove 49 Guide protrusion 50 Guide pieces 52a and 52b Outer side surface 52c Outer end surface 54 Side surface 55 Fillet portions 48a and 48b Groove inner side surface 48c Groove inner surface A Opening and closing direction B Width direction H From the outer end surface of the guide piece Height to the tip of the outer surface I Guide groove depth

Claims (4)

A gate valve having a valve box having a flow path in the valve box therein, a valve body that opens and closes the flow path in the valve box, and guide means that guides the valve body in the opening and closing direction,
The valve body is composed of a valve body main body and a covering member that covers the outer surface of the valve body main body,
The guide means is a concave guide groove formed on the inner surface of the valve box along the opening and closing direction, and a convex shape provided on the side surface in the width direction of the valve body and fitted in the guide groove and movable in the opening and closing direction. And a guide piece covering the outer surface of the guide protrusion,
The guide groove has a pair of groove inner surfaces facing each other in the flow axis direction of the flow path in the valve box, and a groove inner surface formed between the inner ends of both groove inner surfaces,
The guide piece has a pair of outer surfaces facing the inner surface of the groove and an outer end surface facing the groove inner surface,
Each of the pair of groove inner surfaces of the guide groove is inclined so that the distance between the pair of groove inner surfaces decreases toward the back of the guide groove,
Each of the pair of outer surfaces of the guide piece is inclined such that the distance between the pair of outer surfaces decreases toward the outer side in the width direction of the valve body ,
When fully closed, both side surfaces in the width direction of the valve body and both end surfaces in the flow axis direction are in contact with the inner surface of the valve box, and a gap is formed between the guide piece and the guide groove. Gate valve. 2. The gate valve according to claim 1, wherein the fillet portion between the side surface of the valve body and the root of the guide protrusion is not covered with the guide piece and the covering member is exposed. The gate valve according to claim 1 or 2 , wherein the valve body is positioned in the width direction when fully closed. The partition according to any one of claims 1 to 3, wherein a height from an outer end surface of the guide piece to a distal end portion of the outer surface in the width direction of the valve body is higher than a depth of the guide groove. valve.

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